fs2 | File Structures 2 - Memory Mapped File Structures | Key Value Database library

 by   timtadh Go Version: v0.1.0 License: Non-SPDX

kandi X-RAY | fs2 Summary

kandi X-RAY | fs2 Summary

fs2 is a Go library typically used in Database, Key Value Database applications. fs2 has no bugs, it has no vulnerabilities and it has low support. However fs2 has a Non-SPDX License. You can download it from GitHub.

B+ Tree - List - File Structures 2 - Memory Mapped File Structures for Go
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            kandi-support Support

              fs2 has a low active ecosystem.
              It has 389 star(s) with 34 fork(s). There are 20 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 4 open issues and 11 have been closed. On average issues are closed in 93 days. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of fs2 is v0.1.0

            kandi-Quality Quality

              fs2 has 0 bugs and 0 code smells.

            kandi-Security Security

              fs2 has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              fs2 code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              fs2 has a Non-SPDX License.
              Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

            kandi-Reuse Reuse

              fs2 releases are not available. You will need to build from source code and install.
              Installation instructions, examples and code snippets are available.

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            fs2 Key Features

            No Key Features are available at this moment for fs2.

            fs2 Examples and Code Snippets

            No Code Snippets are available at this moment for fs2.

            Community Discussions

            QUESTION

            What's the right way to "log and skip" validated transformations in spark-streaming
            Asked 2022-Mar-09 at 16:57

            I have a spark-streaming application where I want to do some data transformations before my main operation, but the transformation involves some data validation.

            When the validation fails, I want to log the failure cases, and then proceed on with the rest.

            Currently, I have code like this:

            ...

            ANSWER

            Answered 2022-Mar-09 at 16:28

            I would say that the best way to tackle this is to take advantage that the stdlib flatMap accepts Option

            Source https://stackoverflow.com/questions/71411554

            QUESTION

            "NOT EXIST" SQL equivalent to LINQ
            Asked 2022-Jan-31 at 13:56

            SQL statement:

            ...

            ANSWER

            Answered 2022-Jan-31 at 13:56

            Probably you need this part:

            Source https://stackoverflow.com/questions/70920713

            QUESTION

            Concurrent Streams Does't Print Anything to Console
            Asked 2022-Jan-23 at 21:14

            I'm trying to build an example concerning using the Stream.concurrently method in fs2. I'm developing the producer/consumer pattern, using a Queue as the shared state:

            ...

            ANSWER

            Answered 2022-Jan-23 at 21:14

            What's wrong with the above code?

            You are not using the same Queue in the consumer and in the producer, rather each of them is creating its own new independent Queue (the same happens with Random BTW)

            This is a common mistake made by newbies who don't grasp yet the main principles behind a data type like IO

            When you do val queue: IO[Queue[IO, Int]] = Queue.bounded[IO, Int](10) you are saying that queue is a program that when evaluated will produce a value of type Queue[IO, Unit], that is the point of all this.
            The program become a value, and as any value you can manipulate it in any ways to produce new values, for example using flatMap so when both consumer & producer crate a new program by flatMapping queue they both create new independent programs / values.

            You can fix that code like this:

            Source https://stackoverflow.com/questions/70826450

            QUESTION

            WebGL: read from a texture and write the output to a second texture
            Asked 2022-Jan-20 at 22:42

            I am using WebGL2. I have two programs. Program 1 renders my favorite triangle, in my favorite color, into a texture, for safe keeping.

            Program 2 reads the output of program 1 (the first texture) and then renders the contents of that texture.

            This works fine when program 2 renders to the canvas, but I would like program 2 to render to a second texture. So after the first program's draw call I unbind the first fbo, create another fbo backed by a second texture, and then draw.

            ...

            ANSWER

            Answered 2022-Jan-20 at 22:42

            Your function createEmptyTexture binds the texture it creates to the (implicitly) activated texture unit 0, and leaves it bound. So if you want to read from the texture of the first framebuffer you'll need to bind that before rendering with program 2. That being said, usually you'd setup all the vertex-, index- and framebuffers with their respective textures and programs upfront during initialization, your render loop then emits bind, draw and attribute pointer calls.

            Source https://stackoverflow.com/questions/70780656

            QUESTION

            LINQ query where column contains a specific number >= specific value you want to query
            Asked 2022-Jan-18 at 01:47

            I have a table named SubcodeTable and I want to query in SubsidiaryCode where first 3characters is >= to 21Y

            ...

            ANSWER

            Answered 2022-Jan-18 at 01:47

            I finally gotten a solution in SQL. by using LEN then get the length then using LEFT to get the first 2 char.

            Then create a where clause for the condition: LEFT(Whh_SubsidiaryCode,2) >= '20'

            Source https://stackoverflow.com/questions/70736166

            QUESTION

            Ajax POST request with Array[Byte] response
            Asked 2021-Dec-26 at 18:42

            I'm receiving an ajax POST request and need to process the body data as a ByteBuffer and respond with an Array[Byte] using Http4s (0.23.7). This is as far I have been able to put things together, although it's not working yet:

            ...

            ANSWER

            Answered 2021-Dec-26 at 18:42

            The following code is written on top of my head and following the docs, since I can't test it right now.
            (thus it may have some typos / errors; if you find one please feel free to edit the answer and thanks!)

            Source https://stackoverflow.com/questions/70487757

            QUESTION

            FS2 through2 closing all resources when the first stream is finished?
            Asked 2021-Dec-25 at 18:02

            Let's suppose we have 2 fs2 Streams:

            ...

            ANSWER

            Answered 2021-Dec-25 at 17:18

            By checking the implementation of the zipAllWith function I found out that indeed uncons1 in such cases should be avoided. The final solution would be to use the stepLeg function instead of uncons1. So the function from the above should look like this:

            Source https://stackoverflow.com/questions/70473139

            QUESTION

            How to mock MVar2 make method
            Asked 2021-Dec-13 at 16:12

            I'm having trouble mocking the MVar2 method make in my Unit test (using mockito).

            I tried this:

            ...

            ANSWER

            Answered 2021-Dec-13 at 16:12

            I see two issues.

            The first thing, there is no reason to mock IO. You can pretty much do this:

            Source https://stackoverflow.com/questions/70337053

            QUESTION

            Bare metal RISC-V CPU - how does the processor know which address to start fetching instructions from?
            Asked 2021-Nov-23 at 10:58

            I am designing my own RISC-V CPU and have been able to implement a few instruction codes.

            I have installed the RV32I version of the GCC compiler and so I now have the assembler riscv32-unknown-elf-as available.

            I'm trying to assemble a program with just one instruction:

            ...

            ANSWER

            Answered 2021-Nov-23 at 10:58

            how does the processor know which address to start fetching instructions from?

            The actual CPU itself will have some hard-wired address that it fetches from on reset / power-on. Usually a system will be designed with ROM or flash at that phys address. (That ROM might have early-boot code for an ELF program loader which will respect the ELF entry-point metadata to set up an ELF kernel image from ROM, or you could just link a flat binary with the right code at the start of the binary.)

            What is going on here? I thought I'd have a simple single line of hex, but there's a lot more going on.

            Your objdump -D disassembles all ELF sections, not just .text. As you can see, there is only one instruction in the .text section, and if you used objdump -d that's what you'd see. (I normally use objdump -drwC, although -w no line-wrapping is probably irrelevant for RISC-V, unlike x86 where a single insn can be long.)

            Would it be possible to pass the file I compiled above as is to my processor?

            Not in the way you're probably thinking. Also note that you chose the wrong file name for the output. as produces an object file (normally .o), not an executable. You could link with ld into a flat binary, or link and objcopy the .text section out of it.

            (You could in theory put a whole ELF executable or even object file into ROM such that the .text section happens to start where the CPU will fetch from, but nothing will look at the metadata bytes. So the ELF entry-point address metadata in an ELF executable would be irrelevant.)

            Difference between a .o and an executable: a .o just has relocation metadata for the linker to fill in actual addresses, absolute for la pseudo-instructions, or relative for auipc in cases like multiple .o files where one references a symbol from the other. (Otherwise the relative displacement could be calculated at assemble time, not left for link time.)

            So if you had code that used any labels for memory addresses, you'd need the linker to fill in those relocation entries in your code. Then you could objcopy some sections out of a linked ELF executable. Or use a linker script to set the layout for your flat binary.

            For your simple case with only an add, no la or anything, there are no relocation entries so the text section in the .o is the same as in a linked executable.

            Also tricky to get right with objcopy is static data, e.g. .data and .bss sections. If you copy just the .text section to a flat binary, you won't have data anywhere. (But in a ROM, you'd need a startup function that copies static initializers from ROM to RAM for .data, and zeros the .bss space. If you want to write the asm source to have a normal-looking .data section with non-zero values, you'd want your build scripts to figure out the size to copy so your startup function can use it, instead of having to manually do all that.)

            Source https://stackoverflow.com/questions/69834360

            QUESTION

            Select from drop-down menu
            Asked 2021-Nov-23 at 07:23

            On website there is a drop-down menu "Best Time to Contact" and I click on it but I can't choose from the d-d menu. Suggestions?

            ...

            ANSWER

            Answered 2021-Nov-21 at 14:41

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install fs2

            Creating a new B+ Tree (fixed key size, variable length value size). Opening a B+ Tree. Add a key/value pair. Note, since this is low level you have to serialize your keys and values. The length of the []byte representing the key must exactly match the key size of the B+ Tree. You can find out what that was set to by called bpt.KeySize(). As you can see it can be a little verbose to serialize and de-serialize your keys and values. So be sure to wrap that up in utility functions or even to wrap the interface of the B+ Tree so that client code does not have to think about it. Since a B+Tree is a "multi-map" meaning there may be more than one value per key. There is no "Get" method. To retrieve the values associated with a key use the Find method. That interface is easy to misuse if you do not check the error values as show in the example above. An easier interface is provided for all of the iterators (Range, Find, Keys, Values, Iterate) called the Do interface. It is recommended that you always use the Do* interfaces. The other is provided if the cost of extra method calls is too high.
            call bf.Sync() - Note this uses the async mmap interface under the hood. The bytes are not guaranteed to hit the disk after this returns but they will go there soon.
            call bf.Close()
            A command to generate type specialized wrappers around fs2 structures. Since Go does not support generics and is not going to support generics anytime soon, this program will produce a wrapper specialized to the supplied types. It is essentially manually implementing type specialized generics in a very limited form. All fs2 structures operate on sequences of bytes, aka []byte, because they memory mapped and file backed structures. Therefore, the supplied types must be serializable to be used as keys and values in an fs2 structure.
            Assuming you already have the code downloaded and in your GOPATH just run:.

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            gh repo clone timtadh/fs2

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